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 Max age: Maximum age of the configuration BPDU stored on the switch.

 Hello time: Configuration BPDU transmission interval.

 Forward delay: Delay that STP bridges use to transition port state.

Basic concepts in STP

Root bridge

A tree network must have a root bridge. The entire network contains only one root bridge. The root bridge

is not permanent, but can change along with changes of the network topology.

Upon initialization of a network, each device generates and periodically sends configuration BPDUs, with

itself as the root bridge. After network convergence, only the root bridge generates and periodically

sends configuration BPDUs, and the other devices forward the BPDUs.

Root port

On a non-root bridge, the port nearest to the root bridge is the root port. The root port is responsible for

communication with the root bridge. Each non-root bridge has only one root port. The root bridge has no

root port.

Designated bridge and designated port

Table 7 Description of designated bridges and designated ports

Classification

Designated bridge

Designated port

For a device

A device directly connected to the local

device and responsible for forwarding

BPDUs to the local device

The port through which the

designated bridge forwards BPDUs

to this device

For a LAN

The device responsible for forwarding

BPDUs to this LAN segment

The port through which the

designated bridge forwards BPDUs

to this LAN segment

As shown in Figure 15, both Device B and Device C directly connect to the LAN. If Device A forwards

BPDUs to Device B through port A1, the designated bridge for Device B is Device A, and the designated

port of Device B is port A1 on Device A. If Device B forwards BPDUs to the LAN, the designated bridge

for the LAN is Device B, and the designated port for the LAN is port B2 on Device B.

HP A5120 EI Series Configuration Guide

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